<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<div style="height:1200px;width: 30px;background:pink"></div>
	<div style="width:400px;height:400px;background: red;position:fixed;top:0;left:200px;overflow: scroll;">
		<div style="height:1200px;width: 100px;background:blue;"></div>
		<div style="width: 80px;height: 80px;background: green;position: fixed;left:340px;top:0"></div>
	</div>
</body>
</html>